Top AMSOIL Products
The most popular AMSOIL synthetic lubricants — each with a direct link to order through your Authorized Dealer. No pricing shown; order directly on AMSOIL.com with your Preferred Customer discount applied automatically.
Showing 10 of 10 products
Best SellerP.i.® Performance Improver Gasoline Additive
The most powerful gasoline additive available. Cleans fuel injectors, intake valves, and combustion chamber deposits in a single tank. Restores up to 14% fuel economy and reduces emissions.
- Restores up to 14% fuel economy
- Cleans injectors, intake valves & combustion chambers
- Reduces harmful emissions
- One bottle treats one full tank
Top RatedSignature Series 5W-30 100% Synthetic Motor Oil
AMSOIL's flagship motor oil. Engineered for enthusiasts seeking maximum protection and performance. Guaranteed protection for up to 25,000 miles or 1 year, whichever comes first.
- 75% more engine protection against wear
- 50% more cleaning power vs. AMSOIL OE
- Protects turbos 72% better than required
- Up to 25,000 miles or 1 year, whichever comes first
75K+ MilesHigh Mileage 5W-30 100% Synthetic Motor Oil
Specially formulated for vehicles with 75,000+ miles. Contains seal conditioners to rejuvenate aging gaskets and seals, helping reduce leaks and oil consumption common in high-mileage engines.
- Formulated for vehicles with 75,000+ miles
- Seal conditioners reduce leaks & oil consumption
- Full synthetic protection for aging engines
- Fights sludge and varnish deposits
Extended DrainXL Extended-Life 5W-30 100% Synthetic Motor Oil
Engineered for extended drain intervals up to 20,000 miles or 1 year, whichever comes first. Outstanding protection and performance for drivers who want longer oil change intervals.
- Up to 20,000 miles or 1 year, whichever comes first
- Excellent wear protection & engine cleanliness
- Ideal for drivers who want fewer oil changes
- Full synthetic formula
OEM IntervalsOE 5W-30 100% Synthetic Motor Oil
Designed to provide outstanding protection during OEM-recommended drain intervals. The perfect choice for drivers who follow manufacturer maintenance schedules while still wanting full synthetic benefits.
- Designed for OEM-recommended drain intervals
- Full synthetic protection at an accessible price
- Excellent fuel economy
- Exceeds API SP and ILSAC GF-6 specifications
DieselSignature Series Max-Duty 5W-30 Synthetic Diesel Oil
The ultimate protection for diesel engines. Provides 6X more engine protection against wear than required by industry standards. Engineered for Duramax, Cummins, and Power Stroke diesel engines.
- 6X more wear protection than industry standard
- Engineered for Duramax, Cummins & Power Stroke
- Fights soot contamination
- Extended drain capable
Harley-Davidson20W-50 Synthetic V-Twin Motorcycle Oil
Specifically engineered for Harley-Davidson and other V-twin motorcycles. A single oil that lubricates the engine, transmission, and primary chaincase. Reduces heat, wear, and clutch slippage.
- One oil for engine, transmission & primary
- Reduces heat & wear in V-twin engines
- Minimizes clutch slippage
- Recommended for Harley-Davidson motorcycles
Towing & HaulingSevere Gear® 75W-90 Synthetic Gear Lube
Engineered for the most demanding gear applications including towing, hauling, and off-road use. Provides extreme-pressure protection for differentials, axles, and manual transmissions.
- Extreme-pressure protection for differentials
- Ideal for towing, hauling & off-road
- Reduces gear wear under heavy loads
- Excellent thermal stability
Universal FitSignature Series Multi-Vehicle Synthetic ATF
A universal automatic transmission fluid engineered to meet the requirements of most domestic and foreign vehicles. Provides superior protection against heat, wear, and oxidation.
- Universal fit for most domestic & foreign vehicles
- Superior heat & oxidation resistance
- Smooth shifting in all temperatures
- Extends transmission life
25,000 MilesEa® Oil Filters
AMSOIL's premium oil filter featuring a synthetic nano-fiber filtration media that captures 98.7% of particles that cause engine wear. Rated for up to 25,000 miles when used with Signature Series oil.
- 98.7% efficiency at 20 microns
- Rated for up to 25,000-mile drain intervals
- Synthetic nano-fiber media
- Superior to conventional paper filters
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